Hotwell ejector



Lfm@

Sept. 25 1923.

H. F. SCHMIDT HoTwELL EJEcToR Filed Oct. 2. 1920 TOR Patented Sept. 25,1923.

rari-rv HENRY E. SCHMIDT, on swanTHMonE, rENNsYLvAra, assrenon 'rowns'rING- HOUSE ELECTRIC a iirnivuraorunrne COMPANY, a CORPORATION orPENNSYL# VANIA.

HTWELL EJECTOR.

i Application l'ed October 2, 1920. Serial Nol 414,313.

1T@ all whom t may concern Be it known that I, HENRY F. SCHMIDT,

a citizen of thef United States, and a resident of Swarthmoren thecounty of Delaware and State of Pennsylvania, have invented a new anduseful Improvement in Hotwell Ejectors'-, of which the following is aspecication. 4

l/Iy invention" relates to heat conserving apparatus for power plants,Aand more p-articularlyV to that class of apparatus em- VployedV toutilize the Vheat of the exhaust steam dischargedfrom the auxiliariesform ing a part thereof.

.The object of my inventionis to provide imeans whereby the exhauststeam ,discharged from the auxiliaries may be utilized Vtooperate anejector removing condensate from thehotwell of the` condenser and toheat the feed water supplied to the boilers.

A further object of my invention is to provide, in conjunction withauxiliary exhaust steam supplies, a high pressure supply, with automaticcontrolling means whereby motive fluid from the sources will be suppliedin response to the demand orrequirements. e i Y I attain these objectsby cmeans of the apparatus shown in the accompanying draw- Y auxiliarysupplies, to'l furnish therequi'SiQ ing, in whichthe single figure shownis a diagrammatic illustrationof Vmy invention.

In the operation of power plantsit is desirable to utilize all theenergy available for effective work. In such a plant are usuallyturbines with ejectors and condensers associated therewith, feed waterheaters, economizers, `auxiliary pumps and engines all of which aredesigned to produce the highest eliciency in power production. With theusual surfacecondenserhaving a hotwell and ejector associated therewith,I utilize the exhaust steam from partially con* densing units as ,forexample, exhaust steam from an ejector pump, which is usually about 57pounds pressureas the primary source of motive lsupply for the hot-wellejector of the surface condenser. In case of failureY of the abovesource I employ the exhaust steamV from non-condensing units such as aboiler feed pump which exhausts at a higher pressure. yI have furtherprovided for a supply of live steam atl boiler pressure, -to operate the'j ejector upon `failure of the amount of steam. In conjunction with thesupplies enumerated I have associated means actuated `by variations ofpressure within thecondenser land low pressure supply whereby the higherpressures are succes- Vsively added to insure positive and efficientoperation. j v

Referring to the drawing for a more detailed description of invention, Iindicate a surface condenser `at 10, adapted to condense theexhauststeam from the main generating unit of a power plant. Thecondensate from the condenser 10 collects in a hotwell ll from whence itis removed by means of a condensate ejector t9 arranged to be operatedby the exhaust steam froim the partially condensing auxiliaries, by theexhaust steam from the non condensing auxiliaries, and by live steam.Exhaust steam from the partially condensing auxiliaries, ranging inpressure from tive pounds to seven pounds absolute, is supplied througha conduit 12, the supply being controlled by means of a valve 13. Thesteam then passes through a conduit 14 to the chamber 15 of thecondensate ejector 19. The steam nozzle 16 of the ejector expands thesteam from the chamber .15 into the mixing` cham` ber 17 where it mixeswith the condensate iu the hot-well 11, the resultant mixture beingdischarged through a conduit 1,8 to a feedwater heater 19. An overflow2O is provided for the ejector which oiscliarges through conduit 21 intothe condenser 10. The condenser is also provided with an air ejector 22which discharges through a conduit 23 into the feedwater heater 19 Innormal operation of the condensate ejector, the steam from nozzle 16entrains water from the hot well 11 and carries it along 'through themixing chamber 17, where the steam is condensed in the water, so that acompact stream of water is discharged from the mixing chamber 17 intothe diifuser conduit 1S at a considerable ve locity. Under suchconditions, there is no,

tendency for this high velocitystream ofwat-er to' overflowinto thechamber20,- but rather will the fluids in the chamber 2O be entrained inthe rapidly moving stream of n 19, thereby assisting the ejector 22 inmaintaining Va high vacuum within the condenser.

In case the supply of exhaust steam from the partially condensingauxiliaries is not pounds to ten pounds gage, is supplied through aconduit 25, the supply to Vthe ejector being controlled by means of avalve l 26. Thebalanced valve 27 controlling the admission of steam fromthe non-.condensing auxiliaries to the ejectoris connected to theopposed pressure motor 24 througha rod 28. The supply conduit 25 isfurthermore connectedwith the `feed water heater by a conduit 29, sothat any exhaust steam not utilized by the condensate ejector may beused to heat the feed water for'the boilers. Y

ln Vcase the combined steam from the partially condensing auxiliariesand the non-condensing auxiliaries is not sufficient to operate theejector properly, the opposed pressure motor will then act to openl avalve admitting live steam to' the ejector. Live steam is suppliedthrough a conduit 30, the supply being controlled by means of a valveThe balanced valve 32 controlling the admission of live steam to theejector is connected through a lost link motion'33 and the rod 2S to theopposed pressure motor 24. The live steam after passing the valve 32enters the chamber 34 where it exerts pressure against the face 35 ofthe movable noz-- zle 36, thereby forcing it up against the nozzle 16.The nozzles 36 and16 then act as one nozzle to expand live steam intothe mix ing chamber 17.

The `opposed `pressure motor 24 comprises asingle cylinder 37 providedrwith a Vpiston 38. The chamber 39 above the piston is connected to thesupply conduit 14 by means of a conduit 40 and in a similar way thechamber 41 below the piston is connected t-o the condenser 10 by meansof the conduit 42.

The heated feed water from the feed wa-` ter heater 19 dischargesthrough a conduit conduit 48 to the boilers. The condensate which isemployed as boiler feed Water is thus successively hea-ted in the heater19 by steam from the auxiliaries through pipe 25 `cient to operate thecondensate ejector.

through pipe 23, and then further heated v by furnace gases in theeconomizer 46.

Under normal conditions, 'with all the partiallycondensing auxiliariesruiming, the exhaust steam from this source iis suiiiln case the steamfrom this source is not suiiicient to operate the condensate ejectorproperly, the pressure in the condenser builds up; This increase inpressure is transmitted through the conduit 42 to the chamber 4l belowthe piston 38, with the result that the increase in pressure on'thebottom of the piston 38will tend to open the balance valve 27, admittingsteam from the Anoncondensingauxiliaries to the ejector in additiontothe steam from the partially-condensing auxiliaries. j supply of steamis insufficient to operate' the ejector properly, further increasein'p-res-l sure in the condenserl exerts a greater up-A ward force onthepiston 38', therebyl open-V ing the balance valve 32 in the live steamline. Live steam will then enter the VchamberV 34 and acting on the face35 of nozzle 36, forces the nozzle up against the nozzle 16. An increasein the steam supply through the conduit 14 increases the pressure in theconduit .14, this pressure being transmitted through the conduit 40 tothe chamber 39 of the balance valve. This increase in pressure forcesthe piston 38 down `first closing balance valve'32 and then balancevalve 27`in turn. The ejector then operates under nor'- mal conditions.Y

Whilel have shown my invention in but one form, it will be obvious tothose skilled in the art that it is not so limitedV but is susceptibleof various other changes and modifications, without departing from thespirit thereof and I desire, therefore, that only suchI limitationsshall be placed there upon as are imposed by the prior art or arespecifically set forth in the.` appended claims. 4 Y j lVhat I claimis 1. ln conibinationwith a condenser, an

air ejecting deviceand a condensate-eject-V ing device associatedtherewith, a feed-water heater connected to the Vair and condensateejecting devices,` and a` feed water economizei' connected to Vtheheater, whereby condensate discharged from the condenserV receives heatfrom the air ejecting device and from the economizer. Y j. Y

2. ln ,combination with a condense-r, a condensate-removing devicecomprising an ejector and an'overiow therefor, said overflow beingconnected to upper portion of the condenser, whereby, in .normaloperation, air is withdrawn lthereby from the condenser, a plurality ofsources of-mo-tive iiuid 4different pressures associated Vwith .the yejector, and means controlling the supplyoi ln case this combinedVmoti-vev fluid to said ejector responsive to conduit.

pressure conditions in the condenser.

lnvcombi-nation with a condenser, Va condensate 4ejecting` device, aplural-ity of Huid supply sources associated with the` ejecting device,and control means for one of the sup-ply sources responsive to pressuredifferences in the condenser and the other supply sou-rco. i Y Y 4f. Vincombination `with a condenser `and feed waterheater, allot-well for thecondenser, an ejector adapted towithdraw condensate from the hot-well,an overflow chamber at the discharge end of the ejector,

a conduit leading from the overflow chamber to the top portion of theVcondenser,a conduit leading from theY overflow *chamber to thefeed-water heater, and `means responsive to the pressure within thecondenser for con trolling the supply of motive fluid to the ejector. YY

5. In combination with Aa "condenser, a hot-well, an Vejector adapted towithdraw condensate from the vhot-well, Van overflow chamber havingcommunication with the top ofthe condenser, three .motive fluid supplyconduits for the ejectoradapted to conduct liuid at different pressures,automatic pressure means for controlling' the flow of fluid through Jtwoof the conduits responsive to the pressure `existing within thecondenser and the pressure within the low-pressure ejector adapted towithdraw condensate from the condenser and discharge it into the feed-Vwater heater, an air ejector adapted to withdraw non-condensable vaporsfrom the condenser and supply them to the heater and means to supplyfluid from the heaterv to the. economizer.V

8.111 combination with a condenser, a feed-water heater, a condensateejector for withdrawing condensate from the condenser and supplying itto theV feed-water heater including an expansion nozzle, a steam chamberconnected to said nozzle, conduits adapted to be connected to partiallycondensing and noncondensing power units and communicating withr thechamber, a high-pressure conduit, "means carried by the high-pressureconduit and movable upon admission of high-pressure steam to afford'direct communication between the expansion .a feed-water heater,

and including a motive fluid nozzle, low,

intermediate, and high-pressure motive fluid supplies adapted tocommunicate with the nozzle, and means for controlling the 'pas sage offiuid from the intermediate and high-pressure supplies responsive topres sures existing within the condenser and within the low-pressuresupply.

10. In combination with a condenser, a hot-well connected tothecondenser, a condensate ejectorassociated 'with the hot-well andincluding a `motive fluidV nozzle, low, intermediate and high pressuremotive fluid supplies adapted to communicate with the nozzle and meansfor controlling the passage of' fluid from the intermediate and highpressure supplies, including a motor device actuated by the differencein pressure existing in the condenser and the low pressure supply.

il. ln combination with a condenser and an economizer, a hot-well forthe condenser, an ejector adapted to withdraw condensate from thelhot-well and discharge it to a pump associated therewith to force theconoensate to an economizer, a plurality of ejector feed supply sourcesat low, intermediate and high pressures, a valve control means for thepressure sources, a conduit leading from condenser to said meansaud aconduit leading from said means to the low and intermediate supplysources whereby the difference of pressure in the condenser and the lowand intermediate pressure sources actuate the valve control means.

12. In combination with a condenser, feed-water heater and economizer,a` condensate ejector adapted to withdraw condensateV from the condenserand to discharge it into a feed-water heater, an air ejector adaptedtorwithdraw non-condensa ble vapors from the condenser and to supplythem to the feed-water heater and a conduit to supply fluid from theheater to the econoinizer, high, intermediate and low pressure supplysource to condensate ejector having pressure control means forcontrolling the respective supply sources in successive operation. 13.In combination with a eondcnser,`liot well and condensate ejector,motive fluid loo supply means for the ejector, comprising Y 10W,intermediate, and high pressure sup- Jlies said low and intermediate sualies arranged to pass through a common element and means responsive topressure differences existing` between the condenser and said elementflor controlling the passage of fluid from saidintermediate and highpressure supplies. Y

141-. In combination with a condenser, a hot-Well, a eed-water heater,and condensate ejector to Withdraw'condensate from 'the hot-well anddeliverit to the 'feed-Water heater,A means comprising` a low-pressureconduit, an intermediate pressure conduit, a Vhign-pressure conduit, andmeans for connecting the conduits With the condensate ejector,successively acting valves Within intermediate, and high pressureconduits actuated by pressure differences Within the condenser and lowVand intermediate .pres- 15. ln combination with a condenser,aleed-Water heater, a condensate ejector torV withdrawing condensatefrom the condenser and supplying it to the feed-Water heater includingan expansion nozzle, a steam chamber connected to said nozzle, conduitsadapted to be connected to condensing and non-condensing power units andcommunicating With the chamber, a high-pressure conduit, an intermediatepressure conduit and a low pressure conduit and a pressure responsivemeans operated by the pressure in the low and intermediate pressureconduits whereby a constant supply of motive fluid is maintained in thesteam chamber at the expansionnozzle.

16. In combination with a condenser, a iot-well, a feed-Water heater anda conden sate ejector (adapted to Withdraw condensate' fluid in threesuccessive stages from the low, Y

intermediate and high pressure sources respectively. l Y.

17. ln combination With a, condenser,A a condensate ejector for saidcondenser,

means for supplying steam to said ejector,v

and means associated with said steam supplying means and responsive tothepres sure WithinV the condenser for regulating the amount` of steamdelivered tothe ejector. Y 1 1S. n combination with a condenser, acondensate' ejector Afor said condenser,

V means for supplying steam tothe ejector :at

different pressures and vmeans associated with said steam supplyingineans and responsive to the Vpressure Within the condenser torregulating the pressure of steam delivered to the ejector. I i

19. In combination With a condenser, a condensate vejector for saidcondenser, means for supplying` steam to the ejector at dierentpressures and means associated with said steam supplying; means andresponsive to increasing pressures Within the condenser or'deliveringsteam' .to the ejector at increasingly higher pressures.

In ltestimony whereof, have hereunto subscribed my name this Q8 day VofSeptember 1920. j

HENRY F. SCHMIDT.

